1. Secure and drain boiler.
  2. Open fireside and water side for cleaning and inspection.
  3. Check heating surfaces and water side for: corrosion, pitting, scale, blisters, bulges, and soot.
  4. Inspect refractory.
  5. Clean water column sight glass.
  6. Clean fire inspection glass.
  7. Disassemble, clean and inspect low water cutoff control(s).
  8. Reassemble boiler and low water cutoff control(s) with new gaskets.
  9. Check blowdown valve packing and lubricate.
  10. Refill boiler.
  11. Perform hydrostatic test if required.
  12. Test safety/relief valves after start-up (full pressure test).
  13. Clean or replace fuel filters.
  14. Clean fuel nozzles.
  15. Clean Burner fan wheel and air dampers.
  16. Clean flames safeguard scanner.
  17. Clean and adjust ignition electrodes.
  18. Check all burner linkage for excessive wear.
  19. Tighten all linkage set screws.
  20. Lubricate motor and shaft bearings.
  21. Check gas valves against leakage (where test cocks are provided).
  22. Replace vacuum tubes (if used) in flames safeguard control.
  23. Clean contacts in program timer.
  24. Check operation of flame safeguard control.
  25. Check operation of modulating motor.
  26. Perform pilot turn down test.
  27. Check operation of low water cutoff and feed controls(s).
  28. Check settings and test all operating and limit controls.



  1. Review manufacturer’s recommendations for boiler and burner start-up.
  2. Check fuel supply
  3. Check auxiliary equipment operations.
  4. Inspect burner boiler and controls prior to start-up.
  5. Start burner, check operating controls.  Test safety controls and pressure relief valve.
  6. Perform combustion test and adjust burner for maximum efficiency.
  7. Log all operating conditions.
  8. Review operating procedures and owner’s log with boiler operator.